When the pully is not active, it is using potential energy. But when a person or a machine uses the pully, they use force to make Kinetic Energy and to lift the box....but that's what i know so far...but i . :)
yes
yes
Pulleys are used to lift objects
For Somethings
It makes the block easier to lift by changing the direction of the force needed to lift it.
A pulley is used to move a heavy weight. You can use a pulley to lift something that you can't lift alone.
I used a pulley to lift the large log.
yes
yes
The pulley was discovered to lift objects that would otherwise be too heavy to lift. Much in the way a crane is used to lift cargo onto ships.
Pulleys are used to lift objects
no
For Somethings
A device used to lift something heavy. By using a pulley, you half the effective weight.
It makes the block easier to lift by changing the direction of the force needed to lift it.
connetions academy huh?
The rack is used to hang laundry indoors. The pulley system is used to lift the rack to a higher elevation in the room where usually the warmer air is located.